* {
  margin: 0;
  padding: 0;
  /* box-sizing: border-box; */
}
body {
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: center;
}
.box {
  width: 270px;
  height: 270px;
  border: 2px solid hotpink;
  margin-top: 20px;
  background-repeat: no-repeat;
  background-image: url(./image/巴黎奥运会_乒乓球_540.jpg);
  background-repeat: no-repeat;
  background-size: 100%;
  /* background-size: 270px; */
}
